<template>
	<view>
		<view class="search-box">
			<!-- 使用 uni-ui 提供的搜索组件 -->
			<uni-search-bar @input="input" :radius="100" cancelButton="none" class="my-search-box"></uni-search-bar>
		</view>
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !== 0">
			<view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
				<view class="goods-name">{{ item.goods_name }}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
		  <!-- 标题区域 -->
		  <view class="history-title">
		    <text>搜索历史</text>
		    <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
		  </view>
		  <!-- 列表区域 -->
		  <view class="history-list">
		    <uni-tag class="mytag" :text="item" v-for="(item, i) in historyList" :key="i" @click="gotoGoodsList(item)"></uni-tag>
		  </view>
		</view>
	</view>
</template>

<script>
import { getSearchList } from '@/api/search.js';
export default {
	data() {
		return {
			timer: null,
			kw: '',
			// 搜索结果列表
			searchResults: [],
			// 搜索历史记录
			historyList: []
		};
	},
	onLoad() {
		this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
	},
	methods: {
		input(e) {
			// 清除定时器
			clearTimeout(this.timer);
			// 重新开启定时器
			this.timer = setTimeout(() => {
				this.kw = e
				// 根据关键词，查询搜索建议列表
				this.getSearchList();
			}, 500);
			// console.log(e)
		},
		async getSearchList() {
			if (!this.kw ) {
				this.searchResults = [];
				return false;
			}
			const { data: res } = await getSearchList({ query: this.kw });
			this.searchResults = res.message;
			// 1. 查询到搜索建议之后，调用 saveSearchHistory() 方法保存搜索关键词
			this.saveSearchHistory()
		},
		gotoDetail(goods_id) {
			uni.navigateTo({
				// 指定详情页面的 URL 地址，并传递 goods_id 参数
				url: '/subpkg/goods_detail/goods_detail?goods_id=' + goods_id
			});
		},
		saveSearchHistory(){
			// 2.1 直接把搜索关键词 push 到 historyList 数组中
			if ( this.historyList.includes(this.kw)){
				this.historyList.splice(this.historyList.indexOf(this.kw),1)
			}
			this.historyList.unshift(this.kw)
			// 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
			uni.setStorageSync('kw', JSON.stringify(this.historyList))
		},
		cleanHistory(){
			this.historyList = []
			uni.setStorageSync('kw','[]')
		},
		gotoGoodsList(kw){
			uni.navigateTo({
			    url: '/subpkg/goods_list/goods_list?query=' + kw
			})
		}
	}
};
</script>

<style lang="scss" scoped>
.search-box {
	position: sticky;
	top: 0;
	z-index: 999;
	.my-search-box /deep/ {
		background-color: #c00000; // 只能在元原ui组件里面修改
		.uni-searchbar{
			width: 100% !important;
		}
	}
}
.sugg-list {
	padding: 0 5px;

	.sugg-item {
		font-size: 12px;
		padding: 13px 0;
		border-bottom: 1px solid #efefef;
		display: flex;
		align-items: center;
		justify-content: space-between;

		.goods-name {
			// 文字不允许换行（单行文本）
			white-space: nowrap;
			// 溢出部分隐藏
			overflow: hidden;
			// 文本溢出后，使用 ... 代替
			text-overflow: ellipsis;
			margin-right: 3px;
		}
	}
}
.history-box {
  padding: 0 5px;

  .history-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }

  .history-list {
    display: flex;
    flex-wrap: wrap;

    .mytag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
